31results about How to "Solve cumulative problems" patented technology

The invention provides a processing method of electroplating wastewater containing cyanogens and chrome, comprising the following steps of: regulating the pH value of mixed electroplating wastewater containing cyanogens and chrome; introducing O3 into an oxidation pond; adding hydrazine hydrate into a reduction pond, and introducing the wastewater into a precipitator after reducing the wastewater; discharging 10-30 percent of clear solution reaching a standard after precipitation, and enabling 70-90 percent of clear solution to flow into a middle wastewater pond; regulating the pH value of the wastewater in the middle wastewater pond, and adding NaHSO3; introducing the wastewater in the middle wastewater pond into a medium filter and a precision filter; introducing the outlet water of the precision filter for first-segment nanofiltration processing; enabling the concentrated water in the first-segment nanofiltration to enter reverse osmosis-segment processing; enabling the concentrated water in the reverse osmosis segment to finally enter second-segment nanofiltration, and enabling the permeation liquid of the second-segment nanofiltration to return to the middle wastewater pond for circular processing; and enabling the permeation concentrated water of the second-segment nanofiltration to return to an original water tank for circular processing. The method can be used for processing the mixed electroplating wastewater containing cyanogen and chrome, other heavy metals and the like, and not only can realize higher recycle rate and lower the cost, but also can reduce energy consumption.

The invention relates to the technical field of infrared spectrum detection, in particular to a portable near-infrared spectrum detection system. The portable near-infrared spectrum detection system comprises a shell, a collection window, detection light sources, a light-splitting device and a detector, and the collection window, the detection light sources, the light-splitting device and the detector are sequentially installed in the shell; a converter and a power supply device are further installed in the shell, the output end of the detector is connected with the input end of the converter, and the power supply device is connected with the detection light sources, the detector and a controller; the portable near-infrared spectrum detection system further comprises a sample pool which is installed on the collection window, the sample pool comprises a sampling part and a fixing seat, a cavity is formed in the sampling part, an opening is formed in one end of the sampling part, and the other end of the sampling part is movably connected in the fixing seat; a piston is arranged at the opening, the sampling part is movably connected in the fixing seat, and the fixing seat is fixedly installed on the collection window. According to the portable near-infrared spectrum detection system, on the condition that the size and weight of equipment are not increased, the detection precision is greatly improved, and the problem that a model is difficult to move is solved.

The invention relates to the technical field of infrared spectrum detection, in particular to a portable near infrared spectrum detection system. The portable near infrared spectrum detection system comprises a shell, as well as a collection window, a detection light source, a beam splitting device and a detector which are arranged in the shell in sequence, wherein the shell is also internally provided with a converter and a power supply device, the output end of the detector is connected with the input end of the converter, the power supply device is connected with the detection light source, the detector and the converter respectively; the system also comprises a sample reservoir, the sample reservoir comprises a sapphire sampling contact surface and a fixed seat, a chamber is formed in the fixed seat and the two ends of the fixed seat are provided with openings, the opening at one end of the fixed seat is fixedly arranged on the collection window, the opening at the other end is fixedly provided with the sapphire sampling contact surface, and the beam splitting device is a linear gradual filter. By using the portable near infrared spectrum detection system provided by the invention, under the condition of not enlarging the equipment size and weight, the detection accuracy is greatly improved, and the problem that a model is difficult to transfer is solved.

The invention relates to the technical field of infrared spectrum detection, in particular to a portable near-infrared spectrum detection system. The system comprises a shell, an acquisition window, a detection light source, a light splitting device and a detector, wherein the acquisition window, the detection light source, the light splitting device and the detector are sequentially installed in the shell from bottom to top. The shell is further internally provided with a converter and a power supply device. The output end of the detector is connected with the input end of the converter, and the power supply device is connected with a detection light source, the detector and the converter. The system further comprises a sample pond which is installed on the acquisition window. The sample pond is divided into a sample placemat part and a fixing part, a blocking piece is arranged in the sample placement part, a through hole is formed in the center of the blocking piece, and the fixing part is fixedly arranged on the acquisition window. The light splitting device is a linear gradually changed optical filter. The portable near-infrared spectrum detection system greatly improves detection precision under the condition that equipment size and weight are not increased, and the problem that model transport is difficult is solved.

The invention provides a detection method for an instrument constant test by adopting a standard meter method. The detection method comprises the following steps of connecting a standard meter with adetected electric energy meter, applying reference voltage of the detected electric energy meter to the standard meter, and reading current forward active total electric energy of the detected electric energy meter as an initial electric energy value, applying the maximum current of the detected electric energy meter to the standard meter, setting a phase angle to be 0 degree, and starting the test after the power output of the standard meter is stable, accumulating the electric energy value of the standard meter, and when the accumulated electric energy value of the standard meter is within apreset range, adjusting the phase angle according to a preset phase shift angle, continuing to accumulate the electric energy value of the standard meter, and when the accumulated electric energy value of the standard meter is not less than a preset standard travel threshold, reading the current forward active total electric energy of the detected electric energy meter as a termination electric energy value, calculating the difference between the final electric energy value and the initial electric energy value of the detected electric energy meter, and calculating the error gamma of the detected electric energy meter, and judging qualification if gamma does not exceed the basic error limit, or otherwise, judging disqualification.

The invention relates to an all-vanadium redox flow battery capacity recovery method and particularly aims at solving the problem that battery capacity is faded due to accumulation of positive pentavalent vanadium when an all-vanadium redox flow battery operates for a long time. According to the method, appropriate amount of ammonium ferrous sulfate can be added to a positive electrolyte in a battery charge and discharge random process, so the ammonium ferrous sulfate reacts with pentavalent vanadium ions in the positive electrolyte, the pentavalent vanadium ions are restored into tetravalent vanadium ions and a battery capacity is recovered. According to the method, the appropriate amount of ammonium ferrous sulfate is added to the positive electrolyte as reductant, the pentavalent vanadium accumulation problem when the battery operates for a long time, the capacity fading problem is finally solved, so the battery can operates stably for a long time and the electrolyte is efficiently utilized. The method is simple in technology, simple and convenient in operation, low in cost and remarkable in effect; and raw materials are simple and easy to get.

The invention discloses a method for treating sewage of artificial board fiber dry tail gas treatment. Artificial board fiber dry tail gas enters the lower part of a spraying washing tower for removing dust and pollutants; circulating water enters the spraying washing tower from the upper part of the tower by a lifting pump and is in reverse contact with the tail gas; then the tail gas subjected to spraying in the tower enters a heat exchange condenser; generated condensate water is discharged into a hydrolysis tank; circulating water passing through the lower part of the tower enters a circulating water tank through a filter; the circulating water tank discharges water to an air floatation tank every day; and treated water discharged from the air floatation tank and the condensate water are discharged into the hydrolysis tank. The mixed wastewater is treated by the hydrolysis tank, and anoxic tank and a membrane bioreactor (MBR) tank; a nitrification liquid flows back to the anoxic tank and the discharged water of the hydrolysis tank is discharged to the anoxic tank; and the nitration liquid flows back to the circulating water tank for replenishment. Aiming at difficulty of tail gas purification wastewater pollution in a production process of an artificial board, the method arranges an online circulating water treatment system and a circulating water discharge bypass treatmentsystem, so that the problems of accumulation of suspended matter and accumulation of formaldehyde and organic matter in discharge water are solved.

The invention discloses a high-performance ceramic tile prepared from red mud. The high-performance ceramic tile is prepared from the following raw materials by weight: 40-45 parts of red mud, 28-32 parts of kaolin, 3-7 parts of silica sand, 5-9 parts of dolomite, 6-10 parts of talcum powder, 4-8 parts of zirconite, 2-5 parts of andalusite, and 9-13 parts of tungsten and molybdenum ores. The invention further discloses a preparation method of the high-performance ceramic tile prepared from the red mud. The prepared ceramic tile uses a large quantity of red mud, is favorable for solving the problem of accumulation of the red mud, is high in strength, is low in water absorbing quality, does not cause the phenomena of black center and bubbles, meets the performance requirement of the market on the ceramic tile, and has a broad market prospect.

The invention relates to an ore dressing method, in particular to a method for ore dressing of bauxite. The method for ore dressing of bauxite comprises the steps of ore grinding and flotation desulfurization. The method is characterized in that the treatment process comprises ore grinding, sediment filtering, bauxite dissolving out and flotation desulfurization; and ore is subject to grinding and synchronously subject to washing. The method guarantees safety of an industrial production flotation desulfurization device and can also effectively solve the problem of accumulation of sulfate radical in a system, good flotation desulfurization process technical indexes can be achieved, the method is suitable for any high-sulfur bauxite and particularly suitable for acidifying the high-sulfur bauxite, the environmental influence of the process is small, and the application prospect is optimistic.

The invention discloses a soil and water salinity regulation and control system for green infrastructures of a sponge city. The system comprises a roof runoff regulation and control system, a municipal road runoff regulation and control system and a greenbelt runoff regulation and control system, wherein the roof runoff regulation and control system comprises a pebble canal, bioretention facilities, a rainwater storage pool, a roof rainwater collection pipe network, a low-salt water body and a greening drip irrigation system; the municipal road runoff regulation and control system comprises aninitial discarding rainwater well, a pebble canal, a strip-shaped low-terrain greenbelt, bioretention facilities, a rainwater storage pool, a municipal road rainwater collection pipe network, a medium-salinity water body and a greening drip irrigation system, and the bioretention facilities are arranged in the strip-shaped low-terrain greenbelt at intervals and used for collecting road runoff pretreated by the strip-shaped low-terrain greenbelt; and the greenbelt runoff regulation and control system comprises a low-terrain greenbelt, a rainwater storage pool, a greenbelt rainwater collectionpipe network and a high-salinity water body. Unconventional water resources can be effectively recycled, soil and water salinity is regulated and controlled, water safety is guaranteed, and a water landscape is built.

The invention relates to a zinc-nickel flow battery, in particular to a zinc-nickel flow battery negative electrode. Zinc oxide is attached to the surface of a substrate. The specific preparation process comprises the following steps of: soaking a matrix in a soluble zinc salt solution for 10-60 minutes at the temperature of 30-50 DEG C, drying at 60-80 DEG C, transferring into a tubular furnace,and firing for 1-5 hours at 300-400 DEG C in an oxygen atmosphere, and obtaining a desired negative electrode. The problem of zinc accumulation of the zinc negative electrode is solved.

The invention provides a processing method of electroplating wastewater containing cyanogens and chrome, comprising the following steps of: regulating the pH value of mixed electroplating wastewater containing cyanogens and chrome; introducing O3 into an oxidation pond; adding hydrazine hydrate into a reduction pond, and introducing the wastewater into a precipitator after reducing the wastewater; discharging 10-30 percent of clear solution reaching a standard after precipitation, and enabling 70-90 percent of clear solution to flow into a middle wastewater pond; regulating the pH value of the wastewater in the middle wastewater pond, and adding NaHSO3; introducing the wastewater in the middle wastewater pond into a medium filter and a precision filter; introducing the outlet water of theprecision filter for first-segment nanofiltration processing; enabling the concentrated water in the first-segment nanofiltration to enter reverse osmosis-segment processing; enabling the concentrated water in the reverse osmosis segment to finally enter second-segment nanofiltration, and enabling the permeation liquid of the second-segment nanofiltration to return to the middle wastewater pond for circular processing; and enabling the permeation concentrated water of the second-segment nanofiltration to return to an original water tank for circular processing. The method can be used for processing the mixed electroplating wastewater containing cyanogen and chrome, other heavy metals and the like, and not only can realize higher recycle rate and lower the cost, but also can reduce energy consumption.

The invention discloses an external blocking type cutter for pipeline cutting. The external blocking type cutter is characterized by structurally comprising a driver, a blocking ring, clamps, a blocking part and a cutting slide path, wherein a cutter is mounted in the cutting slide path; the cutting slide path is integrally formed with the blocking ring; the four clamps are uniformly and mechanically connected on the blocking ring, and are matched with pipelines; the blocking ring is formed by fixing two same semicircular structures through the blocking part; the driver is mounted on the blocking ring to drive the cutter; the inner part of the driver is driven by the motor; the motor is mounted and fixed through a pedestal; the motor is matched with a ventilation opening and a radiating fan, and a first partition plate, a movable inclined plate, a connecting rod, a pushing-pulling body, a second partition plate, a sealing part and a spring shaft are arranged in the ventilation opening;the movable inclined plate is mounted in the ventilation opening through a guide wheel, and can be movably in the form of a right trapezoid; a static inclined plate is closer to the radiating fan, sothat dust taken in can be adsorbed in a static mode, and therefore, taken-in dust is not greatly accumulated on the position, close to the motor, of the ventilation opening, and electrical harm is avoided.

The invention discloses an air filter blowback self-cleaning device for an air compressor, and belongs to the technical field of air filters. The self-cleaning type air filter comprises an air filter shell, a self-cleaning type air filter element is arranged in the air filter shell, a nano coating is arranged on the periphery of the self-cleaning type air filter element, an air filter exhaust port is formed in the axial side of the self-cleaning type air filter element, and a purging unit used for purging the self-cleaning type air filter element is arranged at the air filter exhaust port. The purging unit comprises a high-pressure air pipe and a spray head arranged at the end of one side of the high-pressure air pipe, and the spray head is located at the air filter exhaust port and conducts blowing treatment on the self-cleaning type air filter element. Aiming at the problems existing in the prior art, the invention provides the air filter blowback self-cleaning device for the air compressor, the problem of dust accumulation of an air filter element can be effectively solved, the air filter blowback self-cleaning device is simple in structure and convenient to install, the filter pressure loss is reduced, the service life of the filter element is prolonged, and the operation efficiency of a whole unit is improved.

Provided are an emulsion liquid membrane for extracting copper and cyanide in cyanide waste water and a use method thereof.Raw materials are composed of an oil phase and a water phase, and the raw materials of the oil phase comprise an extraction carrier, a mass transfer modifying agent, a diluent and an emulsifying agent or comprise an extraction carrier, a mass transfer modifying agent, a stabilizer, a diluent and an emulsifying agent.The use method comprises the steps that the emulsion liquid membrane used for extracting copper and cyanide in the cyanide waste water is mixed with cyanide-containing waste water, mechanical stirring is conducted for dispersing and extracting, and standing is conducted for phase separation; 2, an enriched emulsion obtained after phase separation is conducted is demulsified, a regeneration oil phase and an enriched water phase are obtained, and copper and cyanide are recycled from the enriched water phase.By means of the use method, the accumulation problem of copper in minerals in cyanide leaching liquid in the cyanide gold leaching process is effectively solved, the recycling problem of cyanide waste liquid is also solved, and dual value of improving economic benefit and promoting environmental protection is achieved in the cyanide-containing waste water treatment process.

The invention relates to an evaporative transportation device for metal organic chemical source liquid, which is used to realize long-term stable transportation of metal organic chemical source liquid. An evaporation transport device for metal organic chemical source liquid, including a liquid injection device and a thermal evaporation gasification device. The evaporation and transportation device for the metal organic chemical source liquid of the present invention can send the liquid metal organic source to the thermal evaporation gasification device through the liquid injection device for a long time with stable speed and accurate ratio, and complete film deposition in the MOCVD reaction chamber, which can To meet the needs of industrialized long-term continuous, stable and rapid production.

The invention relates to a culture water secondary filter system. A water return pipe passing through the bottom of a tank body is arranged in the center of a culture tank, a water return hole is arranged at the lower part of the water return pipe, a spiral biological ball is arranged in the upper part of the water return pipe, culture water pumped by a diving pump arranged at the bottom of the tank enters the culture water secondary filter system from the water return hole at the lower part of the water return pipe, and goes out after being treated by the spiral biological ball arranged in the upper part of the water return pipe, and the water return pipe is communicated with a water level controller arranged outside the tank body through the water return hole for forming a self flowing type water return system. The culture water carries out deep treatment through the invention, nitrogen elements remained in the water body after the biological filtration treatment are removed at high efficiency, a filter bed is used for culturing and gathering nitrite bacteria and nitrate bacteria, and NH4<+> in the water is promoted to be converted into NO2, and is then converted into NO3. The invention can be used for realizing the complete denitrification of the biological treatment, so the treated water body can be reused, and the invention provides powerful support for the realization of full-sealed circulation culture modes.

The invention discloses alginic acid envelope sustained-release urea with a urease inhibiting effect and a preparation method thereof. The preparation method comprises the following steps of: extracting seaweed or fermented seaweed by using aqueous solution prepared from one or two of sodium hydroxide, potassium hydroxide, sodium carbonate and potassium carbonate; adding water-soluble macromolecules into the extracting solution to dissolve the macromolecules uniformly; adjusting the pH value to be 8.5 by using an organic acid to obtain an envelope material; coating the envelope material on the surfaces of urea particles uniformly; drying instantly with hot wind; and cooling to room temperature by using a fluidized bed to obtain the alginic acid envelope sustained-release urea. The alginic acid envelope sustained-release urea has the advantages of double effects of urease inhibition and sustained release, capacities of effectively improving the utilization ratio of the urea and effectively reducing the loss caused by rain erosion in soil, no toxicity and no harm, stimulation effect on the growth of plants and low price.

The invention relates to a method for preparing 10-deacetylbaccatin III by utilizing a paclitaxel-semisynthesis impurity. A paclitaxel-semisynthesis impurity raw material is dissolved by using an organic solvent; hydrazine hydrate is added into an obtained first mixture to hydrolyze the first mixture; an acidifying agent is added into hydrolyzed mixed liquor to carry out acidification; acidified liquor is neutralized by using weak base, so that the 10-DAB III (10-deacetylbaccatin III) is obtained. According to the method provided by the invention, the paclitaxel-semisynthesis impurity is used as a raw material, is first hydrolyzed by using the hydrazine hydrate, and then is treated by using the acidifying agent to obtain a 10-DAB III coarse product; the 10-DAB III coarse product is purified by using a silica gel chromatographic column to obtain a 10-DAB III product; the 10-DAB III has a yield which is up to 25.6 to 36.8 percent and a content which is up to 98.2 to 99.1 percent; a new approach of obtaining the 10-DAB III product is exploited; not only is the accumulation problem of the impurity in a paclitaxel semisynthesis process solved, but also the raw material is provided for the semisynthesis of paclitaxel; production equipment used in the method provided by the invention is conventional equipment; the used solvent is a conventional solvent; a production condition is easy to implement; the method is simple to operate and suitable for industrialized production. The product can be used for a synthetic raw material for the paclitaxel and docetaxel and is applied to the field of medicines.

The invention relates to a zinc-nickel flow battery, in particular to a negative electrode of a zinc-nickel flow battery, in which zinc oxide is attached to the surface of the substrate; the specific preparation process is as follows: the substrate is immersed in the In the soluble zinc salt solution for 10-60min; after drying at 60-80°C, transfer to a tube furnace, and burn at 300-400°C for 1-5h in an oxygen atmosphere; obtain the required negative electrode. The invention solves the problem of zinc accumulation in the zinc negative electrode.

The invention provides a detection method for meter constant test by adopting the standard meter method, which includes connecting the standard meter with the electric energy meter under inspection; applying the reference voltage of the electric energy meter under inspection to the standard meter, and reading the current normal voltage The active total electric energy is used as the initial electric energy value; apply the maximum current of the tested electric energy meter to the standard meter, set the phase angle to 0°, and start the test after the power output of the standard meter is stable; accumulate the electric energy value of the standard meter, when When the accumulated electric energy value of the standard meter is within the preset range, adjust the phase angle according to the preset phase shift angle; continue to accumulate the electric energy value of the standard meter, and when the accumulated electric energy value of the standard meter is not less than the preset standard travel threshold, read the detected The current total forward active energy of the electric energy meter is used as the termination electric energy value; calculate the difference between the termination electric energy value and the initial electric energy value of the electric energy meter under inspection, and calculate the error γ of the electric energy meter under inspection; if the γ does not exceed the basic error limit, it is pass, otherwise fail.

The invention discloses an online tank edge recovery and circulation method for a plastic electroplating coarsening solution and a using system of the online tank edge recovery and circulation method.The method comprises the following steps that a low-concentration coarsening recovery solution is drained into a multistage decompression evaporator, a high-concentration coarsening recovery solutionand evaporation condensate are extracted, the evaporation condensate is drained into a high-level water storage tank, the high-concentration coarsening recovery solution is pumped into an organic carbon impurity removal aeration system, an organic carbon deslagging agent is added, then aeration is carried out, organic carbon is removed, then filtering and discharging into an electrolytic bath arecarried out, trivalent chromium ions are electrolytically removed, and finally discharging into a concentrated solution storage tank or a coarsening tank is carried out. The using system comprises the multistage decompression evaporator. The multistage decompression evaporator is connected with coarsening solution recovery tanks, the high-level water storage tank and the organic carbon impurity removal aeration system, the organic carbon impurity removal aeration system is connected with the electrolytic bath, and the electrolytic bath is connected with the coarsening tank and the concentrated solution storage tank. According to the online tank edge recovery and circulation method, organic carbon and trivalent chromium in the coarsening solution can be efficiently removed, and the problems of online recovery and recycling of the plastic electroplating coarsening solution can be solved at low cost.

The invention relates to an evaporation and conveying device of metal organic chemical source liquid. The evaporation and conveying device is used for realizing long-time stable conveying of the metalorganic chemical source liquid. The evaporation and conveying device for the metal organic chemical source liquid comprises a liquid injection device and a thermal evaporation and gasification device. According to the evaporation and conveying device for the metal organic chemical source liquid, the metal organic source liquid can be fed into the thermal evaporation and gasification device through the liquid injection device at stable speed and accurate proportions for a long time, film deposition is completed in an MOCVD reaction chamber, and the requirements of long-time continuous, stableand rapid industrial production can be met.

The invention discloses a biomembrane electrode coupled artificial wetland reactor and a sewage treatment method thereof. The biomembrane electrode coupled artificial wetland reactor adopts the upper layer of the artificial wetland with graphite as the anode, and the lower anaerobic environment with steel mesh and activated carbon as the composite cathode. For sewage treatment, the denitrification and microcystin removal efficiency of the reactor can be enhanced by introducing a certain microcurrent. The invention has the advantages of simple device, convenient operation and management, good treatment effect and small occupied area, and can remarkably improve the treatment effect of sewage containing nitrogen and microcystin.

An emulsion liquid membrane for extracting copper and cyanide from cyanide wastewater and a method of using the same. The raw material components are composed of an oil phase and a water phase. The raw materials of the oil phase are extraction carriers, mass transfer modifiers, and diluents. Agents and emulsifiers, or extraction carriers, mass transfer modifiers, stabilizers, diluents and emulsifiers; the usage method is: (1) Combine the emulsion liquid membrane used to extract copper and cyanide in cyanide wastewater with cyanide-containing The wastewater is mixed, mechanically stirred for dispersion and extraction, and allowed to stand for phase separation; (2) Demulsify the enriched emulsion obtained after phase separation to obtain a regenerated oil phase and an enriched water phase, and recover copper and cyanide from the enriched water phase. The method of the present invention effectively solves the problem of accumulation of copper in minerals in the cyanide leachate during the cyanide gold extraction process, and also solves the problem of recycling cyanide waste liquid, and has the advantages of improving economic benefits and promoting the treatment of cyanide-containing wastewater. The dual value of environmental protection.

The invention discloses an indoor robot positioning method by combining a visual odometer and a physical odometer. The method is characterized in that by collecting the images, ORB characteristics are extracted for image coupling, camera position and pose estimation, and closed loop detection to accurately position the robot. The visual odometer is added in a known environment for closed loop detection on the robot, the accumulated error of the physical odometer based on particle filter is eliminated, the global error of the odometer is changed to staggered accumulation, and an closed is established based on the above process. The visual odometer is combined for effectively solving the problem of error accumulation of the physical odometer, and realizes automatic positioning and accurate re-positioning of the robot in the known environment, the increased computation burden is not large, efficiency and real-time performance are guaranteed, indoor navigation requirement can be preciously satisfied, and the indoor robot positioning method is effective for solving the problem of inaccurate positioning of the robot under large environment in the prior art.

According to a lower electrode assembly for plasma processing equipment and the plasma processing equipment, for the phenomenon that electrostatic charges in a cooling pipeline are accumulated to generate discharge to damage the lower electrode assembly, the structure of the cooling pipeline is improved, the cooling pipeline is distinguished inside and outside a radio frequency field, the cooling pipeline in the radio frequency field environment is made of a non-metal material, and the cooling pipeline in the non-radio frequency field environment has a low-resistance conductive characteristic. The problem of electrostatic charge accumulation caused by an existing high-resistance cooling pipeline is solved, and electrical damage or other risks caused by electrostatic charge accumulation are greatly reduced.

The invention relates to a method for restoring the capacity of an all-vanadium redox flow battery, in particular to solve the problem of battery capacity attenuation due to the accumulation of pentavalent vanadium at the positive electrode during the long-term operation of the all-vanadium redox flow battery. This method can add an appropriate amount of ammonium ferrous sulfate to the positive electrode electrolyte in any process of charging and discharging the battery. Tetravalent vanadium ions restore battery capacity. The invention solves the problem of accumulation of pentavalent vanadium during long-term operation of the battery by adding an appropriate amount of ammonium ferrous sulfate as a reducing agent in the positive electrolyte, so as to finally solve the problem of capacity fading, and realize long-term stable operation of the battery and high efficiency of the electrolyte use. The invention has the advantages of simple process, convenient operation, simple and easy-to-obtain raw materials, low cost and remarkable effect.